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<FONT color="green">001</FONT>    package com.gwt.ss;<a name="line.1"></a>
<FONT color="green">002</FONT>    <a name="line.2"></a>
<FONT color="green">003</FONT>    import java.io.IOException;<a name="line.3"></a>
<FONT color="green">004</FONT>    import java.lang.reflect.Constructor;<a name="line.4"></a>
<FONT color="green">005</FONT>    <a name="line.5"></a>
<FONT color="green">006</FONT>    import javax.servlet.ServletContext;<a name="line.6"></a>
<FONT color="green">007</FONT>    import javax.servlet.http.HttpServletRequest;<a name="line.7"></a>
<FONT color="green">008</FONT>    import javax.servlet.http.HttpServletResponse;<a name="line.8"></a>
<FONT color="green">009</FONT>    <a name="line.9"></a>
<FONT color="green">010</FONT>    import org.slf4j.Logger;<a name="line.10"></a>
<FONT color="green">011</FONT>    import org.slf4j.LoggerFactory;<a name="line.11"></a>
<FONT color="green">012</FONT>    import org.springframework.security.access.AccessDeniedException;<a name="line.12"></a>
<FONT color="green">013</FONT>    import org.springframework.security.authentication.AuthenticationTrustResolver;<a name="line.13"></a>
<FONT color="green">014</FONT>    import org.springframework.security.authentication.AuthenticationTrustResolverImpl;<a name="line.14"></a>
<FONT color="green">015</FONT>    import org.springframework.security.core.Authentication;<a name="line.15"></a>
<FONT color="green">016</FONT>    import org.springframework.security.core.context.SecurityContextHolder;<a name="line.16"></a>
<FONT color="green">017</FONT>    <a name="line.17"></a>
<FONT color="green">018</FONT>    import com.google.gwt.user.client.rpc.SerializationException;<a name="line.18"></a>
<FONT color="green">019</FONT>    import com.google.gwt.user.server.rpc.RPC;<a name="line.19"></a>
<FONT color="green">020</FONT>    import com.google.gwt.user.server.rpc.RPCServletUtils;<a name="line.20"></a>
<FONT color="green">021</FONT>    import com.gwt.ss.client.exceptions.GwtSecurityException;<a name="line.21"></a>
<FONT color="green">022</FONT>    import com.gwt.ss.shared.GwtConst;<a name="line.22"></a>
<FONT color="green">023</FONT>    <a name="line.23"></a>
<FONT color="green">024</FONT>    /**<a name="line.24"></a>
<FONT color="green">025</FONT>     * Utility for handle GWT RPC response.&lt;br/&gt;<a name="line.25"></a>
<FONT color="green">026</FONT>     * GWT RPC 回應處理工具類別<a name="line.26"></a>
<FONT color="green">027</FONT>     */<a name="line.27"></a>
<FONT color="green">028</FONT>    public final class GwtResponseUtil {<a name="line.28"></a>
<FONT color="green">029</FONT>    <a name="line.29"></a>
<FONT color="green">030</FONT>        private static AuthenticationTrustResolver authenticationTrustResolver = new AuthenticationTrustResolverImpl();<a name="line.30"></a>
<FONT color="green">031</FONT>    <a name="line.31"></a>
<FONT color="green">032</FONT>        private static final Logger LOG = LoggerFactory.getLogger(GwtResponseUtil.class);<a name="line.32"></a>
<FONT color="green">033</FONT>    <a name="line.33"></a>
<FONT color="green">034</FONT>        private static Class&lt;?&gt;[] securityClasses = null;<a name="line.34"></a>
<FONT color="green">035</FONT>    <a name="line.35"></a>
<FONT color="green">036</FONT>        /**<a name="line.36"></a>
<FONT color="green">037</FONT>         * @param ex the gwt exception.<a name="line.37"></a>
<FONT color="green">038</FONT>         * @return the gwt equivalent exception.<a name="line.38"></a>
<FONT color="green">039</FONT>         */<a name="line.39"></a>
<FONT color="green">040</FONT>        public static GwtSecurityException createGwtException(Exception ex) {<a name="line.40"></a>
<FONT color="green">041</FONT>            if (ex == null) { return null; }<a name="line.41"></a>
<FONT color="green">042</FONT>            String className = ex.getClass().getSimpleName();<a name="line.42"></a>
<FONT color="green">043</FONT>            try {<a name="line.43"></a>
<FONT color="green">044</FONT>                for (Class&lt;?&gt; rawClass : getSecurityClasses()) {<a name="line.44"></a>
<FONT color="green">045</FONT>                    Class&lt;? extends GwtSecurityException&gt; securityClass = rawClass.asSubclass(GwtSecurityException.class);<a name="line.45"></a>
<FONT color="green">046</FONT>                    String gwtClassName = securityClass.getSimpleName();<a name="line.46"></a>
<FONT color="green">047</FONT>                    if (gwtClassName.equals("Gwt" + className)) {<a name="line.47"></a>
<FONT color="green">048</FONT>                        Constructor&lt;? extends GwtSecurityException&gt; constructor = securityClass.getConstructor(<a name="line.48"></a>
<FONT color="green">049</FONT>                            String.class, Throwable.class);<a name="line.49"></a>
<FONT color="green">050</FONT>                        return constructor.newInstance(ex.getMessage(), ex);<a name="line.50"></a>
<FONT color="green">051</FONT>                    }<a name="line.51"></a>
<FONT color="green">052</FONT>                }<a name="line.52"></a>
<FONT color="green">053</FONT>            } catch (Exception e) {<a name="line.53"></a>
<FONT color="green">054</FONT>                LOG.error(e.getMessage(), e);<a name="line.54"></a>
<FONT color="green">055</FONT>            }<a name="line.55"></a>
<FONT color="green">056</FONT>            // Custom Mappings.<a name="line.56"></a>
<FONT color="green">057</FONT>            // **** Provide any custom mappings here ****<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>            // 沒有可用的映射 No mapping available<a name="line.59"></a>
<FONT color="green">060</FONT>            return null;<a name="line.60"></a>
<FONT color="green">061</FONT>        }<a name="line.61"></a>
<FONT color="green">062</FONT>    <a name="line.62"></a>
<FONT color="green">063</FONT>        /**<a name="line.63"></a>
<FONT color="green">064</FONT>         * @param response the response.<a name="line.64"></a>
<FONT color="green">065</FONT>         * @param e the error.<a name="line.65"></a>
<FONT color="green">066</FONT>         */<a name="line.66"></a>
<FONT color="green">067</FONT>        public static void doUnexpectedFailure(HttpServletResponse response, Throwable e) {<a name="line.67"></a>
<FONT color="green">068</FONT>            if (LOG.isErrorEnabled()) {<a name="line.68"></a>
<FONT color="green">069</FONT>                LOG.error("Encode eunexceptable exception!", e);<a name="line.69"></a>
<FONT color="green">070</FONT>            }<a name="line.70"></a>
<FONT color="green">071</FONT>            if (!response.isCommitted()) {<a name="line.71"></a>
<FONT color="green">072</FONT>                try {<a name="line.72"></a>
<FONT color="green">073</FONT>                    response.setContentType("text/plain");<a name="line.73"></a>
<FONT color="green">074</FONT>                    response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);<a name="line.74"></a>
<FONT color="green">075</FONT>                    response.getWriter().write(e.getMessage());<a name="line.75"></a>
<FONT color="green">076</FONT>                    response.flushBuffer();<a name="line.76"></a>
<FONT color="green">077</FONT>                } catch (IOException ex) {<a name="line.77"></a>
<FONT color="green">078</FONT>                    if (LOG.isErrorEnabled()) {<a name="line.78"></a>
<FONT color="green">079</FONT>                        LOG.error(ex.getMessage(), ex);<a name="line.79"></a>
<FONT color="green">080</FONT>                    }<a name="line.80"></a>
<FONT color="green">081</FONT>                }<a name="line.81"></a>
<FONT color="green">082</FONT>            }<a name="line.82"></a>
<FONT color="green">083</FONT>        }<a name="line.83"></a>
<FONT color="green">084</FONT>    <a name="line.84"></a>
<FONT color="green">085</FONT>        /**<a name="line.85"></a>
<FONT color="green">086</FONT>         * @return the available security exception classes in the com.gwt.ss.client.exceptions package.<a name="line.86"></a>
<FONT color="green">087</FONT>         */<a name="line.87"></a>
<FONT color="green">088</FONT>        private static synchronized Class&lt;?&gt;[] getSecurityClasses() {<a name="line.88"></a>
<FONT color="green">089</FONT>            if (securityClasses == null) {<a name="line.89"></a>
<FONT color="green">090</FONT>                try {<a name="line.90"></a>
<FONT color="green">091</FONT>                    securityClasses = ClassUtil.getClasses("com.gwt.ss.client.exceptions");<a name="line.91"></a>
<FONT color="green">092</FONT>                } catch (Exception e) {<a name="line.92"></a>
<FONT color="green">093</FONT>                    if (LOG.isErrorEnabled()) {<a name="line.93"></a>
<FONT color="green">094</FONT>                        LOG.error(e.getMessage(), e);<a name="line.94"></a>
<FONT color="green">095</FONT>                    }<a name="line.95"></a>
<FONT color="green">096</FONT>                }<a name="line.96"></a>
<FONT color="green">097</FONT>            }<a name="line.97"></a>
<FONT color="green">098</FONT>            return securityClasses;<a name="line.98"></a>
<FONT color="green">099</FONT>        }<a name="line.99"></a>
<FONT color="green">100</FONT>    <a name="line.100"></a>
<FONT color="green">101</FONT>        /**<a name="line.101"></a>
<FONT color="green">102</FONT>         * @param authentication the current authentication.<a name="line.102"></a>
<FONT color="green">103</FONT>         * @return is the user anonymous?<a name="line.103"></a>
<FONT color="green">104</FONT>         */<a name="line.104"></a>
<FONT color="green">105</FONT>        public static boolean isAnonymous(Authentication authentication) {<a name="line.105"></a>
<FONT color="green">106</FONT>            return authenticationTrustResolver.isAnonymous(authentication);<a name="line.106"></a>
<FONT color="green">107</FONT>        }<a name="line.107"></a>
<FONT color="green">108</FONT>    <a name="line.108"></a>
<FONT color="green">109</FONT>        /**<a name="line.109"></a>
<FONT color="green">110</FONT>         * Determine whether request comes from GWT.<a name="line.110"></a>
<FONT color="green">111</FONT>         * <a name="line.111"></a>
<FONT color="green">112</FONT>         * @param request the request.<a name="line.112"></a>
<FONT color="green">113</FONT>         * @return is the request from GWT RPC?<a name="line.113"></a>
<FONT color="green">114</FONT>         */<a name="line.114"></a>
<FONT color="green">115</FONT>        public static boolean isGwt(HttpServletRequest request) {<a name="line.115"></a>
<FONT color="green">116</FONT>            if (request == null) { return false; }<a name="line.116"></a>
<FONT color="green">117</FONT>            // Check for the request factory header.<a name="line.117"></a>
<FONT color="green">118</FONT>            String header = request.getHeader(GwtConst.GWT_RF_HEADER);<a name="line.118"></a>
<FONT color="green">119</FONT>            if (header != null &amp;&amp; header.equalsIgnoreCase("true")) { return true; }<a name="line.119"></a>
<FONT color="green">120</FONT>            // Check for the gwt-rpc content type.<a name="line.120"></a>
<FONT color="green">121</FONT>            String contentType = request.getContentType();<a name="line.121"></a>
<FONT color="green">122</FONT>            if (contentType != null &amp;&amp; contentType.startsWith(GwtConst.GWT_RPC_CONTENT_TYPE)) { return true; }<a name="line.122"></a>
<FONT color="green">123</FONT>            return false;<a name="line.123"></a>
<FONT color="green">124</FONT>        }<a name="line.124"></a>
<FONT color="green">125</FONT>    <a name="line.125"></a>
<FONT color="green">126</FONT>        public static void processGwtException(ServletContext servletContext, HttpServletRequest request,<a name="line.126"></a>
<FONT color="green">127</FONT>                HttpServletResponse response, Exception ex) {<a name="line.127"></a>
<FONT color="green">128</FONT>            try {<a name="line.128"></a>
<FONT color="green">129</FONT>                GwtSecurityException gwtEx = createGwtException(ex);<a name="line.129"></a>
<FONT color="green">130</FONT>                if (gwtEx != null) {<a name="line.130"></a>
<FONT color="green">131</FONT>                    // Get the authentication information.<a name="line.131"></a>
<FONT color="green">132</FONT>                    Authentication authentication = SecurityContextHolder.getContext().getAuthentication();<a name="line.132"></a>
<FONT color="green">133</FONT>                    boolean anonymous = authentication == null || isAnonymous(authentication);<a name="line.133"></a>
<FONT color="green">134</FONT>                    if (!anonymous) {<a name="line.134"></a>
<FONT color="green">135</FONT>                        // Add authentications information to the exception.<a name="line.135"></a>
<FONT color="green">136</FONT>                        gwtEx.setAuthenticated(authentication.isAuthenticated());<a name="line.136"></a>
<FONT color="green">137</FONT>                        gwtEx.setAuthenticatedUser(authentication.getName());<a name="line.137"></a>
<FONT color="green">138</FONT>                    }<a name="line.138"></a>
<FONT color="green">139</FONT>                    if (LOG.isErrorEnabled()) {<a name="line.139"></a>
<FONT color="green">140</FONT>                        String extra = "";<a name="line.140"></a>
<FONT color="green">141</FONT>                        if (ex instanceof AccessDeniedException) {<a name="line.141"></a>
<FONT color="green">142</FONT>                            extra = String.format(" (user is%1$s anonymous)", anonymous ? "" : " not");<a name="line.142"></a>
<FONT color="green">143</FONT>                        }<a name="line.143"></a>
<FONT color="green">144</FONT>                        LOG.error("Encode {}{}: {}",<a name="line.144"></a>
<FONT color="green">145</FONT>                            new Object[] { gwtEx.getClass().getSimpleName(), extra, gwtEx.getMessage() });<a name="line.145"></a>
<FONT color="green">146</FONT>                    }<a name="line.146"></a>
<FONT color="green">147</FONT>                }<a name="line.147"></a>
<FONT color="green">148</FONT>                String payload = RPC.encodeResponseForFailure(null, gwtEx == null ? ex : gwtEx);<a name="line.148"></a>
<FONT color="green">149</FONT>                writeResponse(servletContext, request, response, payload);<a name="line.149"></a>
<FONT color="green">150</FONT>            } catch (SerializationException ex1) {<a name="line.150"></a>
<FONT color="green">151</FONT>                doUnexpectedFailure(response, ex);<a name="line.151"></a>
<FONT color="green">152</FONT>            }<a name="line.152"></a>
<FONT color="green">153</FONT>        }<a name="line.153"></a>
<FONT color="green">154</FONT>    <a name="line.154"></a>
<FONT color="green">155</FONT>        public static boolean shouldCompressResponse(String responsePayload) {<a name="line.155"></a>
<FONT color="green">156</FONT>            return RPCServletUtils.exceedsUncompressedContentLengthLimit(responsePayload);<a name="line.156"></a>
<FONT color="green">157</FONT>        }<a name="line.157"></a>
<FONT color="green">158</FONT>    <a name="line.158"></a>
<FONT color="green">159</FONT>        public static void writeResponse(ServletContext servletContext, HttpServletRequest request,<a name="line.159"></a>
<FONT color="green">160</FONT>                HttpServletResponse response, String responsePayload) {<a name="line.160"></a>
<FONT color="green">161</FONT>            if (!response.isCommitted()) {<a name="line.161"></a>
<FONT color="green">162</FONT>                try {<a name="line.162"></a>
<FONT color="green">163</FONT>                    boolean gzipEncode = RPCServletUtils.acceptsGzipEncoding(request)<a name="line.163"></a>
<FONT color="green">164</FONT>                            &amp;&amp; shouldCompressResponse(responsePayload);<a name="line.164"></a>
<FONT color="green">165</FONT>                    RPCServletUtils.writeResponse(servletContext, response, responsePayload, gzipEncode);<a name="line.165"></a>
<FONT color="green">166</FONT>                    response.flushBuffer();<a name="line.166"></a>
<FONT color="green">167</FONT>                } catch (IOException ex) {<a name="line.167"></a>
<FONT color="green">168</FONT>                    doUnexpectedFailure(response, ex);<a name="line.168"></a>
<FONT color="green">169</FONT>                }<a name="line.169"></a>
<FONT color="green">170</FONT>            }<a name="line.170"></a>
<FONT color="green">171</FONT>        }<a name="line.171"></a>
<FONT color="green">172</FONT>    <a name="line.172"></a>
<FONT color="green">173</FONT>        /**<a name="line.173"></a>
<FONT color="green">174</FONT>         * Private constructor.<a name="line.174"></a>
<FONT color="green">175</FONT>         */<a name="line.175"></a>
<FONT color="green">176</FONT>        private GwtResponseUtil() {<a name="line.176"></a>
<FONT color="green">177</FONT>            super();<a name="line.177"></a>
<FONT color="green">178</FONT>        }<a name="line.178"></a>
<FONT color="green">179</FONT>    <a name="line.179"></a>
<FONT color="green">180</FONT>    }<a name="line.180"></a>




























































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